Method of making tubing



June 24,1930. l c. E. GITHLER I 1,767,923

7 I METHOD OF MAKING TUBING- Filed May 51, 1928 2 Sheets-Sheet 1 1. 1 2. l I v II I 1 I I INVENTOR I of in t e manufacture of striped tubing by my shown in Fig. 17.

' vicinity of the end of 'ing considerable difiiculties'have, been exit in the accompanying method a quantity 0 ered on the end of a blow iron 22 (Fig.2 1-)..-add1t10nalclear glass around-the preferably with the Patented June 24, 1 930 cx uarns r. 'errnma, or confirms, nEw' or some, NEW .vo'ax,

' NT OFFICE.

YORK, Assumes T0 comfme GLASS worms, A CORPORATION or NEW YORK mnon or name TUBING This invention relates 'to the art of tubing and more, particularly to a process of manufacturing tubing having a stripe of contrastin color in proximity to the bore.

In previous methods of making such tubperrenced in controlling the width and position of the stripe, and it is an object of the present invention toprovide an improved method of making striped tubing.

With the above and other objects in --view, which will be apparent asthe description proceeds, I have set forth my invention in the following specification and illustrated drawings, in. which Figs. 110 are ongitudinal sections through the end of a blow pipe and a gather lass thereon showing successive steps new method, Fig. 10 being siderably reduced scale; v Figs. 11 and 12 are longitudinal and transverse sections .showing the next step in my method of.making tubing;

Figs. '13 and 14 are similar views of a further step in my method;

Figs. 15 andlfi are similar views showing a still further step in my method; 1

Fig. 17 is atransverse section corresponding to Fig. 16 but showing a modified form oftubin ;and Y Figs. 18 and 19 are a transverse section and a partial vertical elevation, respectively, on an enlarged scale, .of finished tubing made from a blank having the cross section shown on a con- Acgording to the referred form of my clear glass 21 is gath- This is then marvered aidof a flat paddle (not shown is given a circular cross section (Fi 2).

The glass is then indented at 23 in the the blow iron and at gather (Fig. 3), the

until a holdfor the draw the gather indents it at 30 is then cracked off- (Fig. 9

7 shape to this gather Application med m a1, 1928. Serial No. 281,779,

indenting at 23 serving to prevent the glass" 25 'which'is in direct contact} with't he" sides of the blow iron from pulling away there from in the further is subjected, and thethe blow iron 22 to forma cavity 25' (F 1g.

operations to which it A indenting at 24 serv-f -ing to confine the extent of the blow (de- 4) that eventually forms the bore of the tubing. The operator then seizes the portion 26 which extends beyond the indentation 24 and pulls it outwardly to slightly elongate the cavity, and he further indents the gather at 27, which is at av point ping the cavity. The extendin v 26 1s then cracked off by means 0% an ordinary glass workers tool (not shown), leaving the end 28 of the cavity exposed (Fig. 6). The 0 erator then flares the ather outwardly F the far end of the colored lassextending slightlyinto the bore of the glow iron (Fig.

The operator then closes the cavity and indents it at 30 to provide a convenient next operation, which is to outwardly, after which he This pro'ecting portion 31 thuscom' leting steps 1n the formation-of t e tubthe initial ing blank. I

The remaining steps are then the same I to define the portion of the ather which isto be incorporated in the overlapportion Fig. 7) and inserts a stripe of colored glass 29 in' the flared gather with as; these 'ordinarily usedin the manufacture of tubing and consistingathering 32 to form the gather '33 (Fig. 10), gather-- mg more clear lass and imparting a ball (Figs. lljand "12), elongating. the gather by marvering and swinging until the bore is of the proper length and shape,

and applying a stripe of int glass j jrzo light shield 34:, if the tubing is provided but onthe same side .of colored stripe 29 (Figs.

ditional glass ular way."

' substantially 1 the colored stripe white enamel 34 on'the outside of the gather the bore as the 13 and 14). Ad- 35 is then gathered (Figs. 15 and 16) and, if lens fronttubing is to be made, the shape shown in 'Fig. 17 is imparted to the blank by lensing in the reg- The blank and drawing out into tubin 36 as shown in Figs. 18 and 19. As in .icated in Fig. 19 a column of fluid 37 placed in the bore of the tubing will be magnified so as to fill the tube up to the height of the liquid, and above this there will be exposed, as a direct continuation of this fluid, 29 which was incorporated into the (gather. On either side of both the fluid an 'the colored stripe and extending throughout the height of the tubing is the with a light shield, and upon both sides vof glielight shield willbe visible the flint glass The glass is reheated from time to time, in the ordinary way, during the carrying out of the above operations. p

:It will be understood that the final shape of the tubing may be round as shown in Fig. 16, lensed as shown in Fig. 17, or any other shape which it it desired to impart to the blank, that. the bore may be made round, oval or any other desired sha e, that the body and stripe may be made 0 any desired combination of glasses, and that the light shieldmay be used or not as desired.

It will therefore be ap arent that I have developed a new and use method of making tubin which permits the correct positioning o the colored stripe at the desired osition in the blank, and that its size may readily controlled by the size of the inserted mass of glass (Fig. 7). Furthermore, if desired, a combination of stripes can be inserted in connection with the step shown in Fig. 7 instead of a single stripe.

I claim: a v 1. The method of making'tubing which consists in gathering molten glass on the end of a blow plpe, marvering it, blowing a cavplacing ity in the glass, opening the cavit a strip of glass in the cavity, 0 osing the opening, gathering additional glass, elongat- ,ing, mar vering and drawing out the gather to form tubing of the desired size.

2. The method of making tubing which consists in collecting molten glass on the end of a blow pipe, shaping it, forming a cavity, opening-up the cavity at one end and insert- -mg colored glass within the bore, closing the cavity, recovering and drawing.

3. The ,method of making tubing which of .a bloyw pipe,'marv ering it, blowing a cav ity m the glass, opemng the cavity, placing a is thenvready for reheatingcavity, placing a strip of marvering it, elong the gather to give of a blow pipe,

strip of glass in the cavity, closing the cavit y, gathering additional glass therearound, marvering it, elongating the cavlty and forming a bore of the desired shape, gathering additional glass therearound, marvering the gather to give it the desired shape of the finished tubing, and drawing out. the gather to form tubing of the desired size 4. The method of making tubing .wh1ch consists in gathering molten glass on the end of a blow pipe, marvering it, indenting it in proximity to the end of the blow pipe, blowing a cavity in the glass, removing the outer end of the gather to expose the end of the glass in the gather, gathering additional glass therearound, ating the cavity and forming a bore of the desired shape, gathering additionalglass therearound, marvering it the desired shape of the finished tubing, and drawing out the gather to form tubing of the desired size.

5; The method of making tubing which consists in gathering molten glass on the end of a blow pipe, marvering it, indenting it in in a cavity in the glass, removing end of the gather to expose the end of the cavity, opening said gather,placing a strip of glass in the gather with its far end extending into the end of the bore of the blow pipe, closing the gather, gathering additional glass therearound, marvering 1t, elonproximity to the end of the blow pipfi, blot:-

e on r gating the cavity and forming a bore of the desired shape, gathering additional glass therearound, marvering the gather to ive it the desired shape of the finished tubing, and drawing out the gather to form tubing of the desired size.

6. The method of making tubing which consists in gathering molten glass on the end marvering it, indenting it in proximity to the end of the. blow pipe, blowing a cavity in the glass, pulling the tip of the gather outwardly to constrict the outer end of the cavity, removing said outer end of the gather to expose the end of the cavity, opening said gather, placing a strip of glass in the gather with its far end extending into 7. The method of making tubing which consists in gathering molten glass on the end of a blow pipe, marvering it, indenting pit in proximity to the end of the blow pipe,

blowing a cavity in the glass, pulling the tip of the gather outwardly to constrict the outer end of the cavity, removing said outer memes,

end of the gather to ex osetheend' of the cavity, opening saidgat er, placing a strip of glass in the gather with its far end extending into the end of the bore of the blow pipe, closing the gather, removing the outer end of the gather without exposing the cm?- ity, gathering additional glass therearound, marvering it, elongating the cavity and forming a bore of the desired shape, applying a light shield to the-gather on the same side of the bore as the inserted glass, gathering additional glass therearound, marvering the gather to give it the desired shape of the finished tubing, and drawing out the gather to form tubing of the desired size.

' J CHARLES GI'lHLER. 

